1941
Industrial Invention Patent (more)
Electric heater with pedal control and change-over switch for an extensive temperature adjustment.
1952
Industrial Invention Patent (more)
Device for simultaneous electronic control of battery cells on electric storage batteries, in particular for fast battery chargers
1955
Industrial Invention Patent (more)
Safety step-down transformer which does not absorb current when quiescent. Suitable for low voltage outlets to be installed as an ordinary outlet.
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